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zephyr/samples/modules/lvgl/accelerometer_chart/README.rst

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samples: lvgl: sensor: Add LVGL sample for real-time sensor data chart This adds a new sample for LVGL that displays a real-time chart for accelerometer data acquired from &accel0 sensor. This also adds the appropriate overlays so that the sample can also run on native POSIX and native sim using emulated BMI160. Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
2023-10-02 17:43:44 +08:00
.. zephyr:code-sample:: lvgl-accelerometer-chart
:name: LVGL line chart with accelerometer data
:relevant-api: display_interface sensor_interface
Display acceleration data on a real-time chart using LVGL.
Overview
********
doc: Revamp sensor docs Docs now start at a high level, discussing sensors, attributes, channels, and reading data from them. Followed by more detailed usage guides in how to solve common problems sensor users may run into. Additionally renames the sensor_api sphinx tag to sensor Signed-off-by: Tom Burdick <thomas.burdick@intel.com>
2024-06-05 05:39:55 +08:00
A sample application that demonstrates how to use LVGL and the :ref:`sensor` to
samples: lvgl: sensor: Add LVGL sample for real-time sensor data chart This adds a new sample for LVGL that displays a real-time chart for accelerometer data acquired from &accel0 sensor. This also adds the appropriate overlays so that the sample can also run on native POSIX and native sim using emulated BMI160. Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
2023-10-02 17:43:44 +08:00
display acceleration data on a line chart that is updated in real time.
This sample creates a line chart with three series, one for each axis of the accelerometer. An LVGL
timer fetches the latest acceleration data from the sensor every 20 ms (default value) and updates
the chart. The update period is configurable, see
:ref:`lvgl_accelerometer_chart_building_and_running` below.
Requirements
************
* A board with a display.
* A sensor that provides acceleration data (:c:enumerator:`SENSOR_CHAN_ACCEL_XYZ`) and available
under the ``&accel0`` Devicetree alias.
.. note::
A Devicetree overlay declaring an emulated BMI160 accelerometer is provided for the
``native_posix*`` and ``native_sim*`` board variants, making it possible to run this sample on
your local machine.
.. _lvgl_accelerometer_chart_building_and_running:
Building and Running
********************
The maximum number of points to display for each series and the sampling rate of the
accelerometer can be configured using the :kconfig:option:`CONFIG_SAMPLE_CHART_POINTS_PER_SERIES`
and :kconfig:option:`CONFIG_SAMPLE_ACCEL_SAMPLING_RATE` Kconfig options, respectively.
The default sampling rate is 50 Hz, and the default maximum number of points per series is 50.
The demo can be built as follows (note how in this particular case the sampling rate is set to a
custom value of 20 Hz):
.. zephyr-app-commands::
:zephyr-app: samples/modules/lvgl/accelerometer_chart
:host-os: unix
samples/modules/lvgl: Switch from native_posix to native_sim In the docs replace the references to native_posix with native_sim. And switch the default test platform to native_sim from native_posix. Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
2023-11-10 20:04:45 +08:00
:board: native_sim
samples: lvgl: sensor: Add LVGL sample for real-time sensor data chart This adds a new sample for LVGL that displays a real-time chart for accelerometer data acquired from &accel0 sensor. This also adds the appropriate overlays so that the sample can also run on native POSIX and native sim using emulated BMI160. Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>
2023-10-02 17:43:44 +08:00
:gen-args: -DCONFIG_SAMPLE_ACCEL_SAMPLING_RATE=20
:goals: run
:compact: